What has a higher melting point, SiO2 or C6H12O6?

Question

Also, I want to know why. Finally, if C6H12O6 has more hydrogen bonds, would it have a higher melting point?

Answer 1

C6H12O6 definitely does NOT have the higher melting point. Although it has hydrogen bonds and strong London forces (as it is a big molecule), SiO2 is what's called a Covalent Network Solid, where silicon and oxygen atoms are bonded to one another by covalent bonds. Although it looks like the solid is composed of molecules, it is not, atoms are its structural unit. And SiO2 is actually quartz. These solids have the highest melting points in world, and diamond (composed strictly of Carbon atoms covalent bonded to one another) has THE highest melting point on earth.



Here's a link of an image of its structure: http://upload.wikimedia.org/wikipedia/commons/f/fd/SiO2_-_Quarz_-_2D.png

Answer 2

Silicon dioxide, SiO2 (in the form of cristobalite) melts at 1723 ± 5°C.

Glucose, C6H12O6, melts at 146 °C.



Silicon dioxide forms a very wide-spread tetrahedral lattice of ionic bonds, which are much harder to break than the hydrogen bonds between molecules of glucose.

Answer 3

well the molecule with the stronger bonds would have a higher melting point, so if c6h12o6 had more hydrogen bonds, it would have a higher melting point.

Answer 4

SiO2 because it is a covalent crystal and CO2 is a gas.

Answer 5

C6H12O6

Answer 6

yes, c6H1206 Does